Added level increase and high score management

alien_invasion.py

@@ -3,6 +3,7 @@ from time import sleep
 import pygame
 from settings import Settings
 from game_stats import GameStats
+from score_board import ScoreBoard
 from button import Button
 from ship import Ship
 from bullet import Bullet
@@ -23,6 +24,7 @@ class AlienInvasion:
     pygame.display.set_caption("Alien Invasion")
     self.bg_color = self.settings.bg_color
     self.stats = GameStats(self)
+    self.score_board = ScoreBoard(self)
     self.ship = Ship(self)
     self.bullets = Group()
     self.aliens = Group()
@@ -49,7 +51,7 @@ class AlienInvasion:
       alien = Alien(self)
       alien_width, alien_height = alien.rect.size
       current_x, current_y = alien_width, alien_height
-      while current_y < (self.settings.screen_height - 3 * alien_height):
+      while current_y < (self.settings.screen_height - 3 * alien_height) and current_y < 10 * alien_height:
         while current_x < (self.settings.screen_width - 2 * alien_width):
           self._create_alien(current_x, current_y)
           current_x += 2 * alien_width
@@ -112,7 +114,11 @@ class AlienInvasion:
     """Start a new game when the player clicks Play."""
     button_clicked = self.play_button.rect.collidepoint(mouse_pos)
     if button_clicked and not self.game_active:
+      self.settings.initialize_dynamic_settings()
       self.stats.reset_stats()
+      self.score_board.prep_score()
+      self.score_board.prep_level()
+      self.score_board.prep_ships()
       self.game_active = True
       self.bullets.empty()
       self.aliens.empty()
@@ -145,16 +151,29 @@ class AlienInvasion:
   def _check_bullet_alien_collisions(self):
     """Respond to bullet-alien collisions."""
     collisions = pygame.sprite.groupcollide(self.bullets, self.aliens, True, True)
+
+    if collisions:
+      for aliens in collisions.values():
+        self.stats.score += self.settings.alien_points * len(aliens)
+      self.score_board.prep_score()
+      self.score_board.check_high_score()
+      self.score_board.prep_level()
+      self.score_board.prep_ships()
+
     if not self.aliens:
       # If the fleet is empty, create a new fleet.
       self.bullets.empty()
       self._create_fleet()
+      self.settings.increase_speed()
+      self.stats.level += 1
+      self.score_board.prep_level()
 
   def _ship_hit(self):
     """Respond to the ship being hit by an alien."""
     if self.stats.ships_left > 0:
       # Decrement ships_left and reset the game state.
       self.stats.ships_left -= 1
+      self.score_board.prep_ships()
       self.bullets.empty()
       self.aliens.empty()
       self._create_fleet()
@@ -180,6 +199,7 @@ class AlienInvasion:
       bullet.draw_bullet()
     self.ship.blitme()
     self.aliens.draw(self.screen)
+    self.score_board.show_score()
     if not self.game_active:
       self.play_button.draw_button()
     pygame.display.flip()

game_stats.py

@@ -5,8 +5,10 @@ class GameStats:
         """Initialize statistics."""
         self.settings = ai_game.settings
         self.reset_stats()
+        self.high_score = 0
 
     def reset_stats(self):
         """Initialize statistics that can change during the game."""
         self.ships_left = self.settings.ship_limit
-        self.score = 0
+        self.score = 0
+        self.level = 1

score_board.py

@@ -0,0 +1,80 @@
+import pygame.font
+from pygame.sprite import Group
+from ship import Ship
+
+class ScoreBoard:
+  """Class to report scoring information."""
+
+  def __init__(self, ai_game):
+    """Initialize scorekeeping attributes."""
+    self.ai_game = ai_game
+    self.screen = ai_game.screen
+    self.screen_rect = self.screen.get_rect()
+    self.settings = ai_game.settings
+    self.stats = ai_game.stats
+
+    # Font settings for scoring information.
+    self.text_color = (30, 30, 30)
+    self.font = pygame.font.SysFont(None, 48)
+
+    # Prepare the initial score image.
+    self.prep_score()
+    self.prep_high_score()
+    self.prep_level()
+    self.prep_ships()
+
+  def prep_score(self):
+    """Turn the score into a rendered image."""
+    rounded_score = round(self.stats.score, -1)
+    score_str = f"{rounded_score:,}"
+    self.score_image = self.font.render(score_str, True, self.text_color,
+        self.settings.bg_color)
+    # Display the score at the top right of the screen.
+    self.score_rect = self.score_image.get_rect()
+    self.score_rect.right = self.screen_rect.right - 20
+    self.score_rect.top = 20
+
+  def prep_high_score(self):
+    """Turn the high score into a rendered image."""
+    high_score = round(self.stats.high_score, -1)
+    high_score_str = f"{high_score:,}"
+    self.high_score_image = self.font.render(high_score_str, True,
+        self.text_color, self.settings.bg_color)
+
+    # Center the high score at the top of the screen.
+    self.high_score_rect = self.high_score_image.get_rect()
+    self.high_score_rect.centerx = self.screen_rect.centerx
+    self.high_score_rect.top = self.score_rect.top
+
+  def prep_level(self):
+    """Turn the level into a rendered image."""
+    level_str = str(self.stats.level)
+    self.level_image = self.font.render(level_str, True, self.text_color,
+        self.settings.bg_color)
+
+    # Position the level below the score.
+    self.level_rect = self.level_image.get_rect()
+    self.level_rect.right = self.score_rect.right
+    self.level_rect.top = self.score_rect.bottom + 10
+
+  def prep_ships(self):
+    """Show how many ships are left."""
+    self.ships = Group()
+    for ship_number in range(self.stats.ships_left):
+      ship = Ship(self.ai_game)
+      ship.rect.x = 10 + ship_number * ship.rect.width
+      ship.rect.y = 10
+      self.ships.add(ship)
+
+  def show_score(self):
+    """Draw the score and high score to the screen."""
+    self.screen.blit(self.score_image, self.score_rect)
+    self.screen.blit(self.high_score_image, self.high_score_rect)
+    self.screen.blit(self.level_image, self.level_rect)
+    self.ships.draw(self.screen)
+
+  def check_high_score(self):
+    """Check to see if there's a new high score."""
+    if self.stats.score > self.stats.high_score:
+      self.stats.high_score = self.stats.score
+      self.prep_high_score()

settings.py

@@ -21,4 +21,26 @@ class Settings:
     # Alien settings
     self.alien_speed = 1.0
     self.fleet_drop_speed = 10
+
+    self.speedup_scale = 1.1
+    self.score_scale = 1.5
+
+    self.initialize_dynamic_settings()
+
+  def initialize_dynamic_settings(self):
+    """Initialize settings that change during the game."""
+    self.ship_speed = 1.5
+    self.bullet_speed = 3.0
+    self.alien_speed = 1.0
     self.fleet_direction = 1  # 1 represents right; -1 represents left
+
+    # Scoring
+    self.alien_points = 50
+
+  def increase_speed(self):
+    """Increase speed settings and alien point values."""
+    self.ship_speed *= self.speedup_scale
+    self.bullet_speed *= self.speedup_scale
+    self.alien_speed *= self.speedup_scale
+
+    self.alien_points = int(self.alien_points * self.score_scale)

ship.py

@@ -1,10 +1,12 @@
 import pygame
+from pygame.sprite import Sprite
 
-class Ship:
+class Ship(Sprite):
   """A class to manage the ship."""
 
   def __init__(self, ai_game):
     """Initialize the ship and set its starting position."""
+    super().__init__()
     self.screen = ai_game.screen
     self.settings = ai_game.settings
     self.image = pygame.image.load('images/ship.bmp')